Anchorage device



Sept. l, l931- R. s. PEIRCE 1,821,400

ANCHORAGE DEVICE Filed Jan. 28h 1926 Patented Sept. l, 1931 `namen s.ramon, or Emsnann, InLINoIs Anonoaxen nnvrcn application' med January2s, 192e'.- serm 1ro. 84,432. y

My invention relates to anchorage' devices, and in one of its aspects,to such devlces which employ sleeves having tapering'bores and which arereceivable within openings provided in ,a wall or other support andwhichare adapted to be expanded into holding engagement with thesupport bymeans of expanding screws or rodsdriven into the sleeves. In suchdevices, the smaller ends of the bores are placed innermost within theopenings that are formed in the walls or other suppor'ts that are toreceive the anchoring devices. Workmen frequently insert' the sleeveswron end to. To uard against this Wrong use o the sleeves, form themwith portions at .the smaller ends of the bores that 'are in line withthe bores, these portions desirably completely closing the smaller endsof the bores. Inthe use of an anchoring that is to be inserted first isreadily discerned.

In accordance with another feature of my invention, the expanding rod,which is received in the sleeve to be substantially coaxial therewith,has a lateral portion or portions which find. passage through the sleeveinto direct holding engagement with the support.. The expanding rod isdesirably in the 0rm of a screw whose threads penetrate the sleeve flaterally and preferably; at vintervals into holding engagement wit thesupport. In accordance with another object ofthe invention, I em loy anexpanding rod and a securing mem er extending alon the e x panding rodsaid expanding ro having a thread of a diameter to enter the securingmember laterally when the rod is driven, the angle defined between the`thread' and a planar portion that includes the portion of the axisextending from vsuch thread to the entering endof the rod being lessthan sixtyfive degrees. In accordance withY another feature of myinvention, I employfan expanding rod withinthreads of gentle slope. Thisstructure enables the ro thus threaded, to be driven as a nail and to beturned somewhat as a screw as which Fig. l is a side elevation of thesleeve thus constructed, the end of the sleeve i iron or of ductilemetal and substantially coaxial with the sleeve and expanding saidsleeve into engagement with the support and formed with intertwined' aresult of the hammer blows thereon sothat as it is forced into place,channel ways are formed which receive the threads and guard Y the rodfrom withdrawal. l

I will explain my invention more fully by 5s reference to theaccompanying drawings-in referred form of expanding rod.; Fig.l 2 is aView in elevation of thecomplete anchorage device with the wall carryinit shown in sec-, tion and an object supporte by theexpanding rod alsoshown in section; Fig. 3 is a longitudinal sectionalvv view of thevpreferred form of sleeve; Fig; 4-isa view similar to E 1g. 2 beforereception o i kthe anchorage de- 65 vice; and F ig. j isaview similar toFig. 2 with the expanding rod shown mainly in Section and the expandedsleeve also shown in section. The anchorage device includes anfexpand-76ing rod-1 preferably formed with a head 2""4 which is desirabl withYintertwine threads 3 which-are desirably` deep and slope `with res ecttothe axis of the screw less than forty-five degrees, the i5.

.threaded portion ofthe rod from crown to crownof the screw threadkbeing desirably of the'same diameter as the Unthreaded ob- )ect holdingportion ofthe rod Vwhich is adyac ent the head. The sleeve orfsecuringmemso cast metal such as such'as lead. The y sleeve is desirablythreaded` throughout the er 4'may be formed of length of its boresimilarly to the threading ofthe expanding rod so as readily vto take'sa the threa s of the rod, such threading of the sleeve beingespecially desirable if thesleeve is made of castirom- The bore of thesleeve desirably c tapers' whereas the: expanding: rod does not taper,where itis surrounded by '9a the sleeve, except at thel inner end of therod which has a formation 5 in the nature of a point. That is, theentering end of the rod is unthreaded and tapers *to a point. In theuseV of `the anchoragedevice, the sleeve is first inserted, withthesrnalle'r end of theisleeve bore innermost, within the cylindricalopening 6 which is `formed inthe wall 7 or other support, this openingbeing to snugly receivethe sleeve. The me of a size conical. The rod-isformed i 4rod is next inserted into the sleeve, point first. It may behammered into place, the

' ,rod turning as its screw thread follows or `suliiciently thin and thethreading of the exrod is sufliciently deep so that the panding crownsof the threads of the rod will penetrate the sleeve and have directengagement with the support. The interaction of the A sleeve and theexpanding rod is such that the threading of the rod will notcontinuously penetrate the sleeve but only at intervals, such asindicated at 8. The unthreaded portionnof the expanding rod supports anysuitable object 9 through which the rod is passed.

As viewed in elevation, Fig. l, it will be observed that the angledefined between each thread and a planar portion that includes theportion of the axis extending from such thread to the entering end ofthe rod is less than sixty-live degrees. By thus sloping the threads, alateral wedging action is caused upon the surrounding sleeve having aforce greater than the force exerted on the sleeve axially of the nailwhereby the sleeve is prevented from travelling inwardly with the nailbut is held stationary with respect to the wall and with no materialtendency to become hunched or buckled anywhere throughout its length.This characteristic enables the employment of a very thin surroundingsleeve which, if desired, may be readily penetrated by the crowns of thethreads.

In order that the workmen may be guided in the use of anchoring sleevesthat are circumferentially continuous throughout their length and havetapering bores, Whether of the construction shown or of otherconstruction', I provide the sleeve at the end thereof where the bore issmallest with a portion 10 which extends into line with the bore.V In

the preferred embodiment of the invention, Y

the portion 10 is an integral part of the sleeve and is imperforate soas to close the sleeve at the end thereof where the bore is smallest.The point 5 of the expanding rod will find its way through the portion10 of sleeve from being crowded ahead as the rod is being driven, aresult which I believe to be novel in the type of device illustrated.The tapering end ploughs its way through the narrower portions of thesleeve while also expanding these portions. While the bore of the sleeveis wider, at other places, than the tapered end of the rod in the deviceas illustrated, I do not wish to be thus limited nor do I wish to belimited to the preferred sloping ofthe threads.

1Having thus described my invention, I c aim:

In an anchorage, the combination with a my name.

RALPH S. PEIRCE.

the sleeve and will inwardly extend the sleeve into gripping engagementwith the wall portion at the bottom of the opening 6. The tapering endof the rod l is of greater width, at some portion thereof, preferablythe upper or base portion of the tapered end than the narrower portionsof the bore of the sleeve 4, whereby the sleeve is expanded intoengagement with the surrounding wall of the hole in the supportI 7 toprevent this

